feat: support list users

[evansims]

Description

• Parent Epic: https://github.com/openfga/sdk-generator/issues/329

References

Review Checklist

• [x] I have clicked on "allow edits by maintainers".
• [x] I have added documentation for new/changed functionality in this PR or in a PR to openfga.dev [Provide a link to any relevant PRs in the references section above]
• [x] The correct base branch is being used, if not main
• [x] I have added tests to validate that the change in functionality is working as expected

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 59.22990% with 360 lines in your changes missing coverage. Please review.

Project coverage is 68.06%. Comparing base (5a5e26c) to head (f410a6a).

Files	Patch %	Lines
openfga_sdk/models/object_or_userset.py	34.92%	41 Missing :warning:
...k/models/unprocessable_content_message_response.py	34.92%	41 Missing :warning:
openfga_sdk/models/unauthenticated_response.py	46.03%	34 Missing :warning:
openfga_sdk/models/list_users_response.py	52.30%	31 Missing :warning:
...fga_sdk/models/unprocessable_content_error_code.py	36.73%	31 Missing :warning:
openfga_sdk/models/userset_user.py	58.66%	31 Missing :warning:
openfga_sdk/models/fga_object.py	53.84%	30 Missing :warning:
openfga_sdk/models/list_users_request.py	70.58%	30 Missing :warning:
openfga_sdk/models/typed_wildcard.py	47.27%	29 Missing :warning:
openfga_sdk/models/user.py	61.11%	28 Missing :warning:
... and 3 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #94 +/- ## ========================================== - Coverage 69.02% 68.06% -0.97% ========================================== Files 102 114 +12 Lines 8091 8974 +883 ========================================== + Hits 5585 6108 +523 - Misses 2506 2866 +360 ```

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